Department of Biology

Aarhus University Seal / Aarhus Universitets segl

Erik Jeppesen

Could artificial plant beds favour microcrustaceans during biomanipulation of eutrophic shallow lakes?

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  • David Balayla
  • ,
  • Thomas Boll, SDU
  • ,
  • Carolina Trochine
  • ,
  • Erik Jeppesen

Introduction of artificial plants may facilitate the transition from a turbid to a clear-water state in shallow lakes, particularly when plant establishment is delayed. We investigated the usefulness of artificial plants as a restoration tool in an experimental setup mimicking open submerged plant beds with high plant density [80%, HPD] and low plant density [20%, LPD] in shallow Lake Vaeng, Denmark, having undergone biomanipulation in the form of extensive fish removal. Biological measures of the fish, and of both free-swimming (FSM) and plant-attached microcrustaceans (PAM) within the experimental beds and in the lake, were obtained from before, during and after biomanipulation. We found that microcrustacean measures (density, biomass and Cladocera:FSM) were significantly larger in the HPD beds, before and during fish removal, while the effect of plants was not significant after biomanipulation, with low fish biomass. On PAM, these effects were less pronounced and only significant after biomanipulation. Microcrustaceans were larger-bodied at HPD in all years, for both FSM and PAM. In conclusion, artificial plant beds acted as an effective microcrustacea refuge against fish, particularly for the FSM at HPD and in the years with high fish densities, providing further evidence that artificial plant beds could assist lake restoration efforts.

Original languageEnglish
JournalHydrobiologia
Volume802
Issue1
Pages (from-to)221-233
Number of pages13
ISSN0018-8158
DOIs
Publication statusPublished - 2017

    Research areas

  • Body size, Cladocerans, Fish predation, Microcrustacea, Plant-associated microcrustaceans

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